Qatar-1
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Draco |
| Right ascension | 20h 13m 31.6176s |
| Declination | 65° 09′ 43.4909″ |
| Apparent magnitude (V) | 12.84 |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | K3V |
| B−V color index | 1.06 |
| V−R color index | 0.19 |
| J−H color index | 0.472 |
| J−K color index | 0.590 |
| Variable type | planetary transit variable |
| Astrometry | |
| Radial velocity (Rv) | -37.835±0.063 km/s |
| Proper motion (μ) | RA: 12.636±0.048 mas/yr Dec.: 58.170±0.041 mas/yr |
| Parallax (π) | 5.3587 ± 0.0231 mas |
| Distance | 609 ± 3 ly (186.6 ± 0.8 pc) |
| Details[1][2] | |
| Mass | 0.85±0.03 M☉ |
| Radius | 0.823±0.025 R☉ |
| Surface gravity (log g) | 4.536±0.024 cgs |
| Temperature | 4861±125 K |
| Metallicity [Fe/H] | 0.2±0.1 dex |
| Rotational velocity (v sin i) | 1.7±0.3 km/s |
| Age | 4.5 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Qatar-1 is an orange main sequence star in the constellation of Draco.
Star characteristics
[edit]Qatar-1 has an average to high metallicity of 160% of solar,[1] and is of similar age to Sun.[2] The star has significant starspot activity.[4]
Planetary system
[edit]The "Hot Jupiter" class planet Qatar-1b was discovered by the Qatar Exoplanet Survey in 2010.[1] The planetary orbit is likely aligned with the rotational axis of the star, with the misalignment measurement based on the Rossiter-McLaughlin effect equal to −8.4±7.1 degrees.[2] The planet has a large measured temperature difference between dayside (1696±39 K) and nightside (1098±158 K).[5] A spectroscopic study in 2017 does suggest that Qatar-1b has relatively clear skies with a few clouds.[6]
Additional planets or a brown dwarf in the system were suspected in 2013,[7] but were refuted in 2015.[8][9]
The transit-timing variation search in 2020 has also resulted in no detection of additional planets in the system,[10][11] although by 2022 additional transit-timing variation data have suggested the planetary system is accelerating under influence of the unseen long-period companion.[12]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.33±0.05 MJ | 0.02343±0.0012 | 1.4200236±0.0000001[11] | 0.020+0.011 −0.01 |
84.23±0.06° | 1.19±0.09 RJ |
References
[edit]- ^ a b c d Alsubai, K. A.; Parley, N. R.; Bramich, D. M.; West, R. G.; Sorensen, P. M.; Collier Cameron, A.; Latham, D. W.; Horne, K.; Anderson, D. R.; Bakos, G. Á.; Brown, D. J. A.; Buchhave, L. A.; Esquerdo, G. A.; Everett, M. E.; Fűrész, G.; Hartman, J. D.; Hellier, C.; Miller, G. M.; Pollacco, D.; Quinn, S. N.; Smith, J. C.; Stefanik, R. P.; Szentgyorgyi, A. (2011). "Qatar-1b: A hot Jupiter orbiting a metal-rich K dwarf star". Monthly Notices of the Royal Astronomical Society. 417 (1): 709–716. arXiv:1012.3027. Bibcode:2011MNRAS.417..709A. doi:10.1111/j.1365-2966.2011.19316.x. S2CID 55675165.
- ^ a b c d Covino, E.; Esposito, M.; Barbieri, M.; Mancini, L.; Nascimbeni, V.; Claudi, R.; Desidera, S.; Gratton, R.; Lanza, A. F.; Sozzetti, A.; Biazzo, K.; Affer, L.; Gandolfi, D.; Munari, U.; Pagano, I.; Bonomo, A. S.; Collier Cameron, A.; Hébrard, G.; Maggio, A.; Messina, S.; Micela, G.; Molinari, E.; Pepe, F.; Piotto, G.; Ribas, I.; Santos, N. C.; Southworth, J.; Shkolnik, E.; Triaud, A. H. M. J.; et al. (2013). "The GAPS programme with HARPS-N at TNG". Astronomy & Astrophysics. 554: A28. arXiv:1304.0005. doi:10.1051/0004-6361/201321298. S2CID 54793301.
- ^ Qatar 1 -- High proper-motion Star
- ^ Mislis, D.; Mancini, L.; Tregloan-Reed, J.; Ciceri, S.; Southworth, J.; d'Ago, G.; Bruni, I.; Baştürk, Ö.; Alsubai, K. A.; Bachelet, E.; Bramich, D. M.; Henning, Th.; Hinse, T. C.; Iannella, A. L.; Parley, N.; Schroeder, T. (2015). "High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b". Monthly Notices of the Royal Astronomical Society. 448 (3): 2617–2623. arXiv:1503.02246. Bibcode:2015MNRAS.448.2617M. doi:10.1093/mnras/stv197. S2CID 53561305.
- ^ May, Erin; Stevenson, Kevin; Bean, Jacob; Bell, Taylor; Cowan, Nicolas; Dang, Lisa; Desert, Jean-Michel; Fortney, Jonathan; Keating, Dylan; Kempton, Eliza; Komacek, Thaddeus; Lewis, Nikole; Mansfield, Megan; Morley, Caroline; Parmentier, Vivien; Rauscher, Emily; Swain, Mark; Zellem, Robert; Showman, Adam (2022), "A New Analysis of Eight Spitzer Phase Curves and Hot Jupiter Population Trends: Qatar-1b, Qatar-2b, WASP-52b, WASP-34b, and WASP-140b", The Astronomical Journal, 163 (6): 256, arXiv:2203.15059, Bibcode:2022AJ....163..256M, doi:10.3847/1538-3881/ac6261, S2CID 247778438
- ^ von Essen, C.; Cellone, S.; Mallonn, M.; Albrecht, S.; Miculán, R.; Müller, H. M. (2017). "Testing connections between exo-atmospheres and their host stars". Astronomy & Astrophysics. 603: A20. arXiv:1703.10647. doi:10.1051/0004-6361/201730506. S2CID 119452420.
- ^ von Essen, C.; Schröter, S.; Agol, E.; Schmitt, J. H. M. M. (2013). "Qatar-1: Indications for possible transit timing variations". Astronomy & Astrophysics. 555: A92. arXiv:1309.1457. Bibcode:2013A&A...555A..92V. doi:10.1051/0004-6361/201321407. S2CID 119174903.
- ^ MacIejewski, G.; Fernández, M.; Aceituno, F. J.; Ohlert, J.; Puchalski, D.; Dimitrov, D.; Seeliger, M.; Kitze, M.; Raetz, St.; Errmann, R.; Gilbert, H.; Pannicke, A.; Schmidt, J.-G.; Neuhäuser, R. (2015). "No variations in transit times for Qatar-1 B". Astronomy & Astrophysics. 577: A109. arXiv:1503.07191. Bibcode:2015A&A...577A.109M. doi:10.1051/0004-6361/201526031. S2CID 118638934.
- ^ Collins, Karen A.; Kielkopf, John F.; Stassun, Keivan G. (2015). "TRANSIT TIMING VARIATION MEASUREMENTS OF WASP-12b AND QATAR-1b: NO EVIDENCE OF ADDITIONAL PLANETS". The Astronomical Journal. 153 (2): 78. arXiv:1512.00464. doi:10.3847/1538-3881/153/2/78. S2CID 55191644.
- ^ a b Thakur, Parijat; Mannaday, Vineet Kumar; Sahu, Devendra Kumar; Chand, Swadesh; Jiang, Ing-Guey (2020), "Investigating Extra-solar Planetary System Qatar-1 through Transit Observations", Bulletin de la Société Royale des Sciences de Liège: 132–136, arXiv:2007.03753, doi:10.25518/0037-9565.7577, S2CID 54660279
- ^ a b Su, Li-Hsin; Jiang, Ing-Guey; Sariya, Devesh P.; Lee, Chiao-Yu; Yeh, Li-Chin; Mannaday, Vineet Kumar; Thakur, Parijat; Sahu, D. K.; Chand, Swadesh; Shlyapnikov, A. A.; Moskvin, V. V.; Ignatov, Vladimir; Mkrtichian, David; Griv, Evgeny (2021), "Are There Transit Timing Variations for the Exoplanet Qatar-1b?", The Astronomical Journal, 161 (3): 108, arXiv:2012.08184, Bibcode:2021AJ....161..108S, doi:10.3847/1538-3881/abd4d8, S2CID 229181287
- ^ Mannaday, Vineet Kumar; Thakur, Parijat; Southworth, John; Jiang, Ing-Guey; Sahu, D. K.; Mancini, L.; Vaňko, M.; Kundra, Emil; Gajdoš, Pavol; a-Thano, Napaporn; Sariya, Devesh P.; Yeh, Li-Chin; Griv, Evgeny; Mkrtichian, David; Shlyapnikov, Aleksey (2022), "Revisiting the Transit Timing Variations in the TrES-3 and Qatar-1 Systems with TESS Data", The Astronomical Journal, 164 (5): 198, arXiv:2209.04080, Bibcode:2022AJ....164..198M, doi:10.3847/1538-3881/ac91c2, S2CID 252185524
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